github.com/Pyrinpyi/go-muhash

go-muhash

Warning: This is pre-alpha software. The code has not been audited and/or reviewed by anyone other than the author.

go-muhash implements a rolling hash function using a multiplicative hash.
it is based on a multiplicative group over Z=2^3072-1103717 using multiplication and division for adding/removing elements from the hash function.
the current code is heavily based on: https://github.com/bitcoin/bitcoin/blob/a1fcceac69097a8e6540a6fd8121a5d53022528f/src/crypto/muhash.cpp (written by Pieter Wuille, MIT licensed)
But uses BLAKE2B as the hash function and Go's standard library big.Int for fast modular inversions(GCD)

MuHash is the public interface implementing Add/Remove elements functions, and a Finalize function to return a final hash.

uint3072.go is a go implementation of the multiplicative group
num3072.c/h is a C implementation of the multiplicative group
num3072.go is go bindings for the C imlementation

Ideally we will add Go Assembly implementations using SSE2/SSE4.1/AVX and will choose the correct one in runtime, this should also remove the cgo overhead.

Tests

./build_and_test.sh will run all the tests and checks in this library.
./fuzz.sh will run the fuzzer and put new corpus in the corpus directory. by default, it will use go-fuzz But if you run with LIBFUZZER=1 ./fuzz.sh it will run it with libfuzzer
All the current corpus are checked in the unit test in fuzz_corpuses_test.go (requires -tags=gofuzz)